Microstructure and mechanical properties of Mg-Cu-Y-Zn bulk metallic glass matrix composites prepared in low vacuum

来源期刊：中国有色金属学报(英文版)2008年增刊第1期

论文作者：王敬丰 吴夏 潘复生 汤爱涛 丁培道 刘日平

文章页码：278 - 282

Key words：bulk amorphous alloys; magnesium; commercially pure raw materials; microstructure; mechanical property

Abstract: Mg-Cu-Y-Zn bulk metallic glasses (BMG) and in situ bulk metallic glass matrix composites were prepared by copper mold casting under the low vacuum with the argon atmosphere, and the raw materials used in preparing the Mg-Cu-Y-Zn alloys were commercially pure materials. The microstructures of the bulk samples were analyzed by X-ray diffractometer (XRD) and the thermal stability of samples was investigated by using a differential scanning calorimeter (DSC). The thermal stability of sample prepared with commercially pure raw materials is close to that of sample prepared with the high pure raw materials for the BMG Mg_65+X(Cu_0.66Y_0.33)_30-XZn₅ (X=6). With the increase of Mg content, Mg-Cu-Y-Zn composites are prepared, in which Mg solid solution flakes and Y₂O₃ flakes are dispersed. In comparison with monolithic Mg-based BMG alloys, the composites exhibit significant improvement in mechanical properties, e.g. a compressive plastic strain about 7% and an ultimate strength of 1 170 MPa in Mg_65+X(Cu_0.66Y_0.33)_30-XZn₅ (X=14). It is suggested that the enhancement of the mechanical properties of the composites can be attributed to the generation of multiple shear bands and the quantity of the Mg solid solution flakes.

基金信息：the National Basic Research Program of China
the National Outstanding Youth Scientific Fund of China
he Project of CQ CSTC and the State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, China